

a,a:hover,a:active{
    text-decoration: none;
}


.banner img{
    width: 100%;
    height: 100%;
    display: block;
}

.banner{
    width: 1140px;
    height: 400px;
    border: 3px solid #000;
    margin: 50px auto;
    position: relative;
    overflow: hidden;
}

.banner ul{
    width: 500%;
    height: 100%;
    position: absolute;
    top:0;
    left: 0;
}

.banner ul::after{
    display: block;
    content: '';
    clear: both;
}

.banner ul li{
    width: 1140px;
    height: 400px;
    float: left;
}

.banner ol{
    height: 50px;
    background: rgba(0,0,0,0.5);
    position: absolute;
    bottom:50px;
    left:50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
}

.banner ol li{
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #fff;
    margin: 25px 20px;
}

.banner ol li:hover{
    cursor: pointer;
}

.banner ol li.active{
    background: red;
}

.banner div{
    width: 100%;
    height: 50px;
    position: absolute;
    top:50%;
    transform: translateY(-50%);
    left:0;
    display: flex;
    justify-content: space-between;
}

.banner div a{
    font-size: 40px;
    display: flex;
    width: 50px;
    height: 50px;
    justify-content: center;
    align-items: center;
    color: #fff;
    font-weight: 900;
    color: skyblue;
}